KamagraOralJelly is a drug to treat erectile dysfunction (ED, Impotence). Sildenafil dosage is from 25 to 100 mg taken, as needed, approximately 15 minutes before sexual activity, but only once a day.
Sildenafil citrate, commonly known as Viagra, is a drug used to treat male erectile dysfunction (impotence), developed by the pharmaceutical company Pfizer. Part of the physiological process of erection involves the release of nitric oxide (NO) in the corpus cavernosum. This then activates the enzyme guanylate cyclase which results in increased levels of cyclic guanosine monophosphate (cGMP), leading to smooth muscle relaxation in the corpus cavernosum, resulting in increased inflow of blood and an erection.

Side effects :

The most common side effects of Viagra (occurring in more than 2 percent of people) include:
* Headaches --in up to 16 percent of people
* Facial flushing -- up to 10 percent
* Indigestion, known as dyspepsia -- up to 7 percent
* Nasal congestion -- up to 4 percent
* Urinary tract infections (UTI) -- up to 3 percent
* Vision problems, including trouble telling the difference between blue and green, increased sensitivity to light, or blurred vision -- up to 3 percent
* Diarrhea -- up to 3 percent
* Dizziness -- up to 2 percent
* Unexplained rash -- up to 2 percent.
There were some other common side effects (also seen in more than 2 percent of people) that were just as common in people taking a sugar pill instead of Viagra as they were in people taking the actual drug. These side effects included:
* Respiratory tract infections
* Back pain
* Flu-like symptoms
* Joint pain